summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/coco/coco_midi.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/coco/coco_midi.cpp')
-rw-r--r--src/devices/bus/coco/coco_midi.cpp116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/devices/bus/coco/coco_midi.cpp b/src/devices/bus/coco/coco_midi.cpp
new file mode 100644
index 00000000000..965ca3d261a
--- /dev/null
+++ b/src/devices/bus/coco/coco_midi.cpp
@@ -0,0 +1,116 @@
+// license:BSD-3-Clause
+// copyright-holders:tim lindner
+/***************************************************************************
+
+ coco_midi.cpp
+
+ Emulation of Rutherford Research's Midi Pak and also compatible with
+ Go4Retro's MIDI Maestro.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "coco_midi.h"
+
+#include "machine/6850acia.h"
+#include "machine/clock.h"
+#include "bus/midi/midi.h"
+
+namespace {
+
+// ======================> coco_midi_device
+
+class coco_midi_device :
+ public device_t,
+ public device_cococart_interface
+{
+ public:
+ // construction/destruction
+ coco_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ protected:
+ coco_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+ virtual void device_start() override;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override;
+ required_device<acia6850_device> m_acia;
+ void acia_irq_w(int state);
+
+ private:
+ required_device<midi_port_device> m_mdthru;
+};
+
+class dragon_midi_device : public coco_midi_device
+{
+ public:
+ // construction/destruction
+ dragon_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ protected:
+ dragon_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+ virtual void device_start() override;
+};
+
+coco_midi_device::coco_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, type, tag, owner, clock)
+ , device_cococart_interface(mconfig, *this )
+ , m_acia(*this, "mc6850")
+ , m_mdthru(*this, "mdthru")
+{
+}
+
+coco_midi_device::coco_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : coco_midi_device(mconfig, COCO_MIDI, tag, owner, clock)
+{
+}
+
+void coco_midi_device::device_add_mconfig(machine_config &config)
+{
+ ACIA6850(config, m_acia).txd_handler().set("mdout", FUNC(midi_port_device::write_txd));
+ m_acia->irq_handler().set(FUNC(coco_midi_device::acia_irq_w));
+
+ midi_port_device &mdin(MIDI_PORT(config, "mdin", midiin_slot, "midiin"));
+ mdin.rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
+ mdin.rxd_handler().append(m_mdthru, FUNC(midi_port_device::write_txd));
+ MIDI_PORT(config, m_mdthru, midiout_slot, "midiout");
+ MIDI_PORT(config, "mdout", midiout_slot, "midiout");
+
+ clock_device &acia_clock(CLOCK(config, "acia_clock", 31250*16));
+ acia_clock.signal_handler().set(m_acia, FUNC(acia6850_device::write_txc));
+ acia_clock.signal_handler().append(m_acia, FUNC(acia6850_device::write_rxc));
+}
+
+void coco_midi_device::device_start()
+{
+ install_readwrite_handler(0xff6e, 0xff6f,
+ read8sm_delegate(m_acia, FUNC(acia6850_device::read)),
+ write8sm_delegate(m_acia, FUNC(acia6850_device::write)));
+}
+
+void coco_midi_device::acia_irq_w(int state)
+{
+ set_line_value(line::CART, state == 0);
+}
+
+dragon_midi_device::dragon_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
+ : coco_midi_device(mconfig, type, tag, owner, clock)
+{
+}
+
+dragon_midi_device::dragon_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : dragon_midi_device(mconfig, DRAGON_MIDI, tag, owner, clock)
+{
+}
+
+void dragon_midi_device::device_start()
+{
+ install_readwrite_handler(0xff74, 0xff75,
+ read8sm_delegate(m_acia, FUNC(acia6850_device::read)),
+ write8sm_delegate(m_acia, FUNC(acia6850_device::write)));
+}
+
+} // anonymous namespace
+
+DEFINE_DEVICE_TYPE_PRIVATE(COCO_MIDI, device_cococart_interface, coco_midi_device, "coco_midi", "CoCo MIDI PAK")
+DEFINE_DEVICE_TYPE_PRIVATE(DRAGON_MIDI, device_cococart_interface, dragon_midi_device, "dragon_midi", "Dragon MIDI PAK")